JPH0229218B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to a pressure fixing device for an electrophotographic electrostatic recording device using magnetic toner, and more particularly to a device for collecting magnetic toner adhering to a pressure roller. .

(2) Background of the technology In an electrophotographic electrostatic recording device using a one-component developer, a latent image is developed with magnetic toner, and after this is transferred to recording paper, the magnetic toner is recorded using a pressure roller of a pressure fixing device. It is fixed by pressing onto the paper. During this fixing, magnetic toner on the recording paper may adhere to the pressure roller. Such magnetic toner adhering to the pressure roller must be reliably collected because it stains the recording paper during fixing and degrades print quality.

(3) Prior Art and Problems In the conventional magnetic toner recovery device for a pressure fixing device, a toner suction magnet is provided on a scraper for scraping off magnetic toner adhering to a pressure roller, and the toner is scraped off below the scraper. This configuration includes a toner receiver that accommodates magnetic toner. Conventional magnetic toner collection devices like this do not have sufficient collection capacity and can only collect 10,000 to 20,000 A4-sized recording sheets.
When 10,000 sheets were used, the collection capacity became full and toner lumps fell from the toner tray onto the recording paper, staining the printing surface. In order to increase the toner storage capacity, it is not preferable to simply increase the size of the toner receptacle due to the need for device configuration and miniaturization.

(4) Object of the Invention The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a magnetic toner collecting device that increases the toner collecting ability without increasing the shape of the toner receiver.

(5) Structure of the Invention In order to achieve this object, the present invention includes a scraper whose one end contacts a pressure roller and scrapes off the magnetic toner adhering to the pressure roller, and a scraper that scrapes off the magnetic toner adhering to the pressure roller. A toner receiver for accommodating magnetic toner, a toner attracting magnet provided on the other end side of the scraper and on the lower surface side, and a toner attracting magnet further provided on the toner receiver.

(6) Embodiments of the Invention The drawing is a sectional view of a magnetic toner recovery device according to the present invention. The pressure fixing device consists of a first roller 1, a second roller 2, and a third roller 3.
The third roller 3 is urged so as to come into pressure contact with the second roller 2, and is connected by a drive transmission means (not shown) to rotate in the direction of the arrow. A recording paper (not shown) to be fixed passes between the first roller 1 and the second roller 2 in the direction of arrow A with the printed surface facing upward. A magnetic toner recovery device 4 is provided behind the pressure contact portion of the first roller 1, which is the pressure roller. This magnetic toner recovery device 4 is equipped with a frame 5 made of extruded aluminum and a scraper 6 for scraping off the magnetic toner adhering to the surface of the first roller 1. A first magnet 7 is provided to attract and easily release the magnetic toner and to prevent the scraped magnetic toner from scattering around. The frame body 5 further has a felt material 8 impregnated with a small amount of silicone oil in pressure contact with the first roller 1 to completely clean the surface of the first roller 1. A toner receiver 9 is provided below the scraper 6 and is supported by the frame 5 for accommodating the scraped magnetic toner. A second magnet 1 for attracting magnetic toner is located deep inside the toner receiver 9.
0 is set.

(7) Effects of the Invention In the magnetic toner collecting device configured as described above, the magnetic toner scraped off by the scraper 6 falls onto the toner receiver 9 and is further attracted to the back side of the toner receiver 9 by the second magnet 10. As a result, the magnetic toner retention force of the toner receiver 9 increases,
The amount of toner lumps falling onto the printing surface is reduced. As a result, it has become possible to use approximately 40,000 sheets or more of A4 size recording paper without causing toner lumps to fall, while keeping the dimensions of the toner receiver 9 the same as the conventional one.

[Brief explanation of drawings]

The drawing is a sectional view of a magnetic toner collection device according to the present invention. 1...first roller, 5...frame body, 6...scraper,
7...first magnet, 9...toner receiver, 10...second magnet.

Claims (1)

[Claims] 1. A scraper having one end in contact with the pressure roller and for scraping off the magnetic toner adhering to the pressure roller, a toner receiver for storing the magnetic toner scraped off below the scraper, and a toner receiver at the other end of the scraper for scraping off the magnetic toner adhering to the pressure roller; A magnetic toner recovery device for a pressure fixing device, characterized in that a toner suction magnet is provided on the lower surface side, and a toner suction magnet is further provided on the toner receiver.